Automatic telephone system.



Wir/rennes.-

S 8. WILLIAMS, Ja.

AUTOMATIC TELEPHONE SYSTEM. APPLICATION mio Aus 25. 1914. RENEwEn IAN. 23,:911.

1,294,587. Patented Feb. 1s, 1919.

mlm

AUTOMATIC ELPHONE SYSTEM. APPLiLmoN min Au@ 2a` m4.

RENEWED MU). 23| 9,11 1,294,587, Patented Fel. 18, 1919.

5 SHEETS-SHiET 2.

1,294,587. Patented Feb.18,1919.

5 SHEES-SHEET 3.

W/'esse /nvenfok' @9727. we Samue/ 5f W/Y//iamajfr S, B. WLUAMS, he. AUTMAEC TELEPHONE SYSTEM. APPucamm mw ,we 25.` mm www mm. 23. 19:/`

1,294,587. Patented Feb. rI8, 19%9.V

S. B. WILLIAMS, Jn. AUTOMATIC TELEPHONE SYSTEM. Arme/mon mso Auezs. ma. nzuzwso um. 2 3. m1.

n lave/rior: v 0&7, we, Y .Samuel B. VIK/024171.55

Patented Feb. 18, 1919.

i SAMUEL e. WILLIAMS,

call,

UNITED sfrirrnsl PATENT ornicn.

MENTS, T0 WESTERN ELECTRIC NEW YORK.

Jn., on BnooxIiYN, NEW Yonx,

coMrANY, mconronx'rnn, A conomvrron oF ASSIGNOK, BY MESNE ASSIGN- -AUTOMATIC TELEPHONE SYSTEM.

Application led August 25, 1914, Serial No. 858,401. Renewedy January 23,

To all whom it may concern:

Be it known that l, SAMUEL B. WILLIAMS, Jr., a, citizen of the United States residing at Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Automatic Telephone Systems, of which the following is n full, clear, concise, und exact description.

This invention relates to automatic telephone systems, and more particularly to that part of a system by meansof which a callitr line is automatically selected und associa with the remainder of the oflice selecting arpparatus.

In systems of the type toward which the present invention is particularly directed, e number of line finding and connecting circuits are provided for the common'use of u larger number of telephone lines; and when anyr one of the telephone lines initiates u one or another of the line finding switches in which the finder circuits terminate is automatically made operative to connect with the calling line, the finder switch that is made operative being one that is at the time disengaged or idle. The rincipal object' of this invention is to provi e an improved control system for use in such an organization to insure one finder circuit, and one only, being made operativeto connect with u culling line lwhen u call is initiated; to prevent the finden circuit that is -thus made operative fron establishing connection with more thun-one line; and to simplify and improve the part of the organization which hns to do with the preparing or essigning of the finder circuits und switches for serving the calling line.

Another object of the invention is to prevent u single line finding mechanism from searching for und establishing connection with two lines indifi'erentrdronps at the sume time, when calls in dierent groups are initiated simultaneously, orprncticnlly silnultuneousl -.ln the particular embodiment in whic the finding switch is of the multiple brush type, that is of the type in which the movable element is provided with n plurality of brushes, one for euch of the groups of lines served by the switch; The brushes are nor- Speoication of Letters Yatent.

the invention is illustrated,

Patented Feb. 18, 1919.

1917. serial un. 144,059.

melly held in position not to engage their respective stationary terminals, und one or another brush or set of brushes, is tripped und made operative, depending upon the group in which the line that is to be engaged is located.

In automatic telephone systems of the tvpe to which this invention relates, it is the practice to provide a plurality of extension circuits terminating upon Vline finder switches, all of which have access to the same group or groups of lines, so that the calling line may have its connection extended through the medium of any one of the finder switches tht is not another object of this invention is to provide en organization in which the initiation of -a call causes one and only one. of the plurality of. idle finder switches to become active to extend the connection of the calling f line. When n-subscriber calls, one of this" finder switches that is not .in use'is made active through the medium of a starting cir-f cuit common to the finder switches and to the lines that they serve, and makes connection with the calling gline. In its movement the finder switch that is selected places an- 4other finder switch in readiness to respond v of the line from causing the starting of the next finder switch in orde, the syst/cin is so organized that the culling linel is deprived of control over the starting circuit from the time the next finder switch has been placed in readiness until the started switch finds und alters the storting condition of the calling line.

A. further object of this invention resides in the provision'of means whereby when e call is initiated on one of the lines served by u group of finder switches, u tripping devicefwill be actuated-which is arranged to in use at the time. Still sof release any of the brushes of said switches l which lieve access to the culling line terminuls and which ere .1n normal position.

Heretofore, in 'systemen-f this type, a. trip ping device has been #employed for. each switch, sind itl'ms been' I-iecessnry bo operato this device during u preliminary selecting movement of.` the switch in order 'to select actuation of the switch. This allows selection to take place rui'iidly without thel reluthis 3 i Y llt. hes been' the usuel. practice in, telephone systems to equipjench su iscrlger linewith movement required hy previous systems ofv i al line and cut-osll'.reley. In a. 1m" e exrlnmge call is registerei in the'line finder storting distribiiter', wherefthey'en in, tier-'initials to 10ft? circuit, thereby Lstarting c' preselected line which thelinewires nifty b u fin(1e1 which will hunt for the terminals ofu the cnilingline. As Soon :is the line finder" begins to hunt for the callingline terminals, the callingr Vline record is obliterailied by the i i 105 releuse'of. the linefinder starting apluiretus.

v'In vtesting; for the callingline tcrininuls` the line finder hunts for the terminals of linesv which hnvenotf been previously ijimelected.,` i

@Y some other'fiimler switch ori-connected brushes 3 s a w 11g :ith another ceiling line, end tests'thc line 0f the M'ymjfm-Q, I terminals of snr-,1 1 circuits for the calling-line jngfin this JmmIiil-, condition. When the eull'nr lineterniinnls fipjdsmcgii are fourni,y they nire bythe Yfinder .i'tggimingilg film? switch -brushes, .unil t {isuliscriber is then f'fcilar `dixf `i115 connected directly throfigli'the indersWitL-h g'mgntsi f* circuit .to the teleiliiitie` selecting.nppnreths` fgl'mdg M ,in ,et the oitm byumeunjs og'which `my .tlceiilelfl i slip. rngsfgigmd subscriber only be selected' 'unil failed-. 4" `L1. -.f,`md',45giegkg,' H.The invention's illustruted,in the afb'olll- :slip ring@ @1&1 [1": ma pirliiyingdi'ni'vll'll minimali-mf. f hrgsluysgrgecomie ifftligliggf Figure 1' `1S e front ellevetwn. verily m trimmer ign-cuit.' It, eo nenti# follows sermon. of the.llistrihiitferlor cnil .n nder@V thiitiisthehrushes 30,3i-'147.511,' :fgriitu Fig. 2 SiL'Sltl@ Elvllizlll the line! B vvthe drum 20 the. am of Fig. l of the rl ytrilnzltei or rnlllintler, t0 the ml-timmy'digwibutrwilfljg QMSQQR. 41215 the armature `beting Shown pendiiimseetmn; `.tively connected tothese brushes, amffcein-w" ljiir: ,3 `is it siglcfcleytll of the ,line finder theregfby means of the Mahi, imd" switehstizuctm'" Y *i ,er i 37 nnd'tlhe brushes 40,41-'nm'5'i12fm i is? Fill* 4515 f1 will' View of the cmnmntntolrutrilliitcr.circuit. f y bll.; i.; if i s" Thcl'ne finder switch stl'ilctlll;illustncgteglmlll,

this qmpment is very costly. bystems elnboilying this inven'tionfrequire onlyifn 4few relays common to a rroup e@ linelhese relays being associate( vwith it distributer or call linder which successively tests the 'lines of the gronpii.

In the particular embodiment of the invention herein described; si (listribiter Vor call finder circuit, common to a group of telephone lines, picks up niid'reeords en incoming cell. '1 e record of'this incominge Fi 5 is a plan View of a line finder brush, und s pws e portion 0f the lineA finder terminel panelin section; f

Fig. 6 .hows it ,front` view uof the brushtrippingmechenistn and twov brush rods, one in its normal position endll one slightlyV displaced from normal;

` Fig. 7 is n view in brushtripping rod; i

I Fig., 8-is1i sidevviewo a. section of the brush rod with'thc brush. operating mechanism iits actuated osition; 4 Fig, 9` showsthe istributer and sterting hilllts i f Figa 1.0,the1ixie`flnder circuit; and Q prspeetive of the llne-mle; I kmrin with inppinig' rating mega ergil dicen u cintsls'lmwn un:v Thsriinnbmr A .L ind; ance Winry drum* und e Inweb Y, l s2-1 mounted on ftliesliafl. The shalftfff is rigidly enppol'texl. the brackets .und 25. The stetionery fdr-lim 20 ismin effect a commututor-cnsisting Dl" the insu-lated portion 26, in which are mounted `conducting segments such-as 2; zrund 29, `which `represent respectively the tip, ringY nlldeleiv'efgiassigned con 'particular distributor nisln, uppeitrns eonduct'ingse l tl peripheryof this M'Inutnre. "T4 lng segments eregoatrried to theV side of' the l 1n Fig. 3, 1s similar in o eration to the one shown and desrribed in nited States Patent to John N. Reynolds` No. 1,103,623, with the exception of the method of tripping and actuating the brushes,I which will be well understood from the following detailed description. A very brief description herein oi' the operation of the switch is consequently considered suilieicnt.

The motor elements of the switch consist of the two power-driven friction rollers lf3 and 4l, the first of whiolurotates in a. clock- Wise direction to elevate the hruslbrod, while roller 44 rotates in a counter-clockwise direction for returning the bruslrrod to normal.

The upward movement of the brush-rod is under the control of the eleetromagnet fio. 1When thin` magnet is energized it will attraet its e. mature i6, which carries with it the bell Crank/1T which is pivotcd at 48. Due to thin` movement of t`e bell crank 47, the idler pui ley 50 is moved to the right and presses the elevating bar 5l against the power-frietion roller $3. The elef'atingr bar 5l contains a series of notches, as described in the patent to Reynolds above referred to, which, in ronjunetion with theretlining pawl 52, main tain the brush-rod in its elevated position limiten the eleetromagnet 45 is denergized,

and the idler pulley returns to its normal position.

The eleotromagnet controls the return movement ofthe brush-rod. The operation of this magnet, in a manner similar to that described in connection with the magnet. 45, presses the idler pulley 5l against the powerdriven friction roller 44, and aS this roller rotatee, in a counter-clockwise direction, the bruslrrod will he returned to its normal position. The movement of the bell crank Si), associated. with the electroinagnet 53, trips the retaining pawl 52 by means of the finger which roiperates with the lower projection 56 of the retainingr paw] 52.

At the uppermost portion of the switch is mounted a oonunutator bar 57. ,This har is composed of insulating material, and onV one eide tlureof are mounted the condnctin' segments K. X and Y. The brush cooperates with the segments K and X, and the. brush 59 with the Segmente Y and X. The eommutator brushes 58 and 59 are rigidly attalhed to the brush-rod 60, and hence will he elevated and glide over the surface of the e-oinmutator har as the rod 60 is raised. The roudurting strips K and X are so placed and proportioned that the brush 56, in its ugnfard movement, closes contact with the Hlrip K iunnediatelv after one ol" the line finder hi :Shes ie. tripped, and opens before thin lnurih refrein-e the first line terminal in the panel liant'. 'f he brush 59 is in rontalit. with the trrminul trf'p 'l'V when this ln'ush is in ite normal pogition, and the contant is hrokeu before the tripped line linder ln'neh reaehes the first terminal in the panel bank. The brushes 58 and 59 both make Contact. with the terminal strip X when vthe line iuder brush leaves the uppermost terminal of the panel bank.

The reverse side of the eommutator bar, as Shown in Fig. 4, is equipped with the four insulated conducting segments 61. 62, 62 and 6i. Cooperating with these conductingr Segments and in constant contact therewith are the brushes 65, 66, 6T and 68. The eonductingy segment 61 in grounded, while the segments 62, 63 and 6l are Wired to the tip, ring; and sleeve conductors ,respectively of the linefinder circuit. The brush 65 is wired to the eon'unutator brushes and 59, while the brushes 66, 67 and 68 are wired in multiple to all the line finder brushes on the brush-rod of a particular line finder switch. The brushes 65, 66, 67 and 68 are likewise rigidly connected to the hruslrrod 60.

The terminal panel ot each line finder ewiteh is equipped with groups ot' terminale equal in number to the number of dintribul'er circuits, which the line finder switch serves. Each of theee igroups contains a tip, ring and sleeve terminal for nach line connected to its individual distributor circuit. These termi- ,nals are grouped in a vertical row in front of the brushes; of the line finder switch, and are multipled horizontally so as to appear in a rimilar manner in front of the brushes of other line finder swim-hes. This wiringr iS ehown srhematirally in Fig. 1l, in which the (sables 10, 1i, 12 carry the multiple line connections from the distributor circuit to the line finder terminal panel. The position ot the brush-rods of the various line finder Vitt-hea ie elmwn schematieally by the rertical broken linee.

A aeoijated with each group of terminals ie a line finder lirueih, ,auch as shown in Fig. 5. This brush consist-s of the springs 78. T9. H() and Si, which are rigidly supported on a mounting` block 62, which in turn is clamped to the lnueh-rod 6U. Attached to these eprinea are the soldering terminals 9T, S18

and 99. and the Contact. plates T0, 71, 72 and T3, whirl] Serve to Contact with the terminals of the panel whenever thil brush is released. dien the brueh is in its normal position, as' shown in Fig. the rontart plates lo not eonneet with the liml terminale` of the bank. The brush is held in this position by the insulated rollers 76 and TT. These rollers hold the springs Til and R0 in tenaion. and prevent the i-ontact. plates` 71 and 72 from connecting with the line terminals ot' the panel bank. Attached tothe springs To and Sl are the insulating blocks 74 and T5, which ride on the outer Surface of the springs T9 and 80. and nhiffh hold these SpringeA in their normal punition. li'itegfrul with the mounting block 6; in tin` hraeket Eli, whirl; Servon to carriY ihr Innen-tripping and resetting lever.

This brush-tripping and resetting lever consists Vof the cross-piece 93, on which are mounted the rollers iiand 77, and integral with which are the. downwardly ext/ending fingers Ql'nnd 95. The tripping and resety ting lever is mounted in the bracket 91 by means of the pin 92. It follows`r therefore, that if a pressure he exerted upon the finger 94 so as to inove it in a downwardly direction7 the rollers 76 and T7 will moveout of the narrow inrlosure formed hy the springs T9 and S0, and the sprilws 7S, TSL HU and S1, due to their resilience, will move iulolcontnl-,t with the line terminals of the panel bank. Likewise, if a pressure in an upward direclion he e-xertedu )on the linger 93, the rollers will beret-urned to their normal positionE and the brush coniaets will hreak the conneetion with the line terminals of thepanel bank. V

As previously stated and as shown ennventionally in Fig. 11, a plurality of line finders'are mounted in front. of the panel terminal bank. Y At right angles lo the line finder brush-rods and in front and lielow each` group'of line lerminals, extends a eommon brush-tripping rod 83. The movement, of this rod is controlled hy the brush-tripping magnet 8l, When this magnet is energizethit attracts its arnmture S5, which carries with it the ronnecting link SG. The eonneeting'link Sli is pivoted to the lever Si' whieh isxrigiirlly connected to the hruslrrml 83. Foriseqnently, whenever the armature of thebrushtripping magneti@ att-ranted. thise movement will be transferred by means of theelmneobing link S6 andthe lever 87. to the bruslrlrl a Jing rod 83. Jhon thlnushtripping ning reti-is deihiergizerh the brushi tripping rod will lxsreturned to normal .hy means ol a suitable spring. f

Mounted on the lnush-l'ripping rod are a plurality of nippingl pawls HH, one for each lnusll of each llinefilnllleireuit. The )awl SH is loosely 'eonneeled `tothe rod H3. i ssneiul'ed with the paulf ed on tll i i spring' 90' `v i and to h ping dop; dill. ,A

Y rg 4rod` This spring liol iuiwll'lagainst' tie trilpl` o l i sp'l'iigY i i lensioned thntit will havesnlieienbower to trip the brush by Vmeams ofthe ngeriQ-lfand at the same time the spring ouneelion is', sueli that it will allow ,the linger 94 to pass by a tripped pawl S8, ilglfor'amy re lnush mechanism is ont if ljust sticks. to the energzation of the armature of magnet S4, the pawls Uh are displaued from nor-- mal in .suela afnninuer that their outer eX- tremity comer-5 within the path of the downwardly extendiilig finger-'Ul of the brushtrip ring niifhauisnn. ConsefnlentlyY when the lmish-rod is moved in an upward direc l enfer-l u iluminar 'ss Y selected line finder will then ,spari Son, the )ont and Y lWhen the hruuha'ml moved. d1un circuit.

tion, the arm Ell is trippwh moving' the in-Y sulating pleees TG and TT to a positlou nlm-ll will allow the roulant plates ol' the lbrush lo `make Contact with the terminals ol"` the ler millal bank of the line. finder. Winn ihr hruslbrod is returning to normalk flu outer end of the linger olla tripped lirush will move in a plane Containing ille In'nslrlripping rod H3. 'l`lu-relore, just before the ri-ip ping rod returns to normal, it will exon :nl upward pressure on the linger iii, whirl; in turn will reetore the ln'ush to norma aa previously explained. Figs. l5 und e show. the position ol' a brush just about to he restored to norm n l.

In practice the operation of the hruslr tripping' mechanism will preferably he as' follows: lVhen a brush-tripping.; magnet is operated, it will turn he tripping l. and thereby morel the brush-ripping pau is of all the line lindern4 associated with a particular group of line tex-miredYY inte :lne plane ol' the ln-ushelrippingr l-v fl` f its brush-mnh sind thereby trip a brush which will then hunt for the nailing; line. Aft-er the lirnsli rlpped and before ii reaehes the first line erniinal, lhe lli-:ppn magnet- Hfl is released and the lnuslr it pingr lod restored to normal, al whirh une S the renmining;l idle lim` linder elw-nies are again arailahle for another incomingA will` The eireuits of this s reiem are illuelrateil in Figs. E), l0 and lll. To simplify.' these drawings the distributor or call linden", asso elated with the eireuizs shown in Fig". il, is Shown in conventional forni as a series of contact segments 5.1, 2S l 29, repre :ming the tip. ring*T and sleeve Conduttore ol the line, mid a Se oi brushes 30, .all and :l2 roiiperatingl with th "e segments.

Fig. lll shown one eoinplele line 'finder rireuit and the seleeting ril-cuits .for two additional line lindern. The :apparatus and the tiro additional lino finders are identieal with that shown in the first line finder, hut haveheen omitted lirsimplify [he drawing. The. control ling elreuils, :isism'ialed with the vario'l'es parte of the line finder Vireuil whirl: must beestahlished in a definite order at soecessiv'e stages of the operation ol" the system to bring the various parts into operation, aS required, are established by automatic Switching' nnwhanisnis which are called sequene switehes. Onerof ther); sequent-e switehrsls associated with 'each line finder llaeh ol' these sequence Swil'rhes ronsists briefly of a pluralit)I of circuit changing eontaets adapted lio he operated in a definite sequence. The partieular Hime lure is unin'iportant for the purposes ol' the present invenlion, hut a satisfactory type is eonvenlionally illustrated as consisting of a plurality of rotating disks or wipersg Srl? which are represented iii the drawing by a long Contact. A plurality of springs or f brushes are provided for engagement with i rotated.

each pair of conducting plates. In the following description of the system, the brushes or springs, which cooperate with each plate, will be referred to contacts 1., :2, V3 and 4, representing respectively1 the upper lefth'and, the upper right-hand. the lower lefthand and thc lower right-hand contacts. By means of these brushes and a proper cutting away and arrangement of the conducting plates on the insulating disk, any two or more brushes arranged for engagement therewith may be electrically united at any stage of rotation of a shaft.

The sequence-switch positions, at which the various springs or brushes are in engagement with the rotatable disk. are indicated by nu'inerals placed adjacent to the several contacts respectively. Motor mechanism is provided for rotating the shaft in its successive step-by-step movement. These mechanisms, in the embodiment hro-- in shown, comprise continuously rotating friction disks, such as shown at 101, 201 and 301. The rotatable shaft of each sequence switch is provided with a coperating friction disk, such as shown at 102, and 302. and an electroniagnet provided for causingeffective engagement of the fricf ibn disks, whereby the switch shaft may be Each sequence switch is provided with a special contact A. The numerals appearing adjacent to this contact represent the only positions in which it is open, and consequentlyY the only positions at which the sequence switch can stop. v

The operation of the system will now be described in detail in. connection with the' quently, this relay is intermittently energized as the brushes of the call finder sweep over the sleeve contact segments located in the armature. The attraction of the armatures of relay 122 connects the terminals of ture which are connected with the particuu lar subscribers line. This circuit may be traced from battery, through one winding of the line relay, armature 124 of relay 122, brush 30, segment 2i', through the suiscrihers loop, and back to segment '28, brush 31, contact and armature 125 of relay 122 and the second winding of the line relay, to ground. This will energize the line relay 123, which will attract. its armature and close acircuit from ground by way of its armature and contact, through relay 126, to battery. This will operate relay 126, which will lock over a circuit which may be traced from ground, through the armature of relay 127 and armature 12S, and the coil of relay 126, to battery. The attraction oi armature 129 of relay 12F will complete a circuit from ground, through this armature and its contact, and the high-Wound coil of relay 130, the armature 131, coil and armature 132 of relay 133, and thence by Way of the armature 134 of relay 135 and the armature 136 of relay 137, to battery.

Connected in parallel with the coil of relay 133 and thus included in the circuit just traced, are' the coils of the brush-tripf ping magnet 8l. This circuit may be traced from the armature 132 of relay 133, through the coils of the tripping ma net 84, and back to the armature 131 of re ay 133.Y The completion of this circuit, will energize the relay 130. Relay 133 and theftripping magnet 84. will not be energized, however, because of the hi h-resistance of the windingofi'elay 130. he attraction of the righthand armature of relay 130 will close a circuit froni ground, through the left lowwound coil of relay 130, to armature 131 of relay 133. This, in effect, replaces the ioo ground. which was originally sup lied for close, a circuit from ground by way of the left-hand armature of this relay, through the winding of relay 127 to battery. This will energize relay 127 which will attract y easing this relay. The denergization of relay 126, `in conjunction with the operation of relay 133, will open the operating circuit of relay which will be denergized, and this in ,turn will deenergize' the relay 12"?.`

The operation of rela 133 willV lock this relay over a circuit w ich can be 'traced from ground by :way of armatures 140, 1.31 and the cQil of relay 133, and thence by way of the armatures 132 `and 141 of this relay, through the coil of relay 135 and armature its armature, and` open the locking circuit vof relay 126, thus re 136 of relay 137, to battery. This will permanently lock relays 135 und 133 until the locking circuit is broken et the armature 136 of relay 12-57. The attraction of the nrmature 134 of relay 135 will` remove thtl botbery connection from the multiple circuit to the armatures 132 of the relays 133 of the various line-tindex' starting circuits. This cuts off the electrical connection to the line-- finder circuits from the various dietributer circuits. The operation of this circuit will be explained more fully hereinafter.

The attraction of armature 142 of relay 135 closes e circuit from ground by way of armature 142. through contacte 4, and 1 of sequence switch syring 103 and relay 143. to battery. It is assumed in this connection tht the sequenee switch of this first line finder circuit hasbeen preselected 11nd is in its second position, the method oi" preselectv ing to be explained later on. The closing: of the circuit just traced will energize the relay 143, which will attract its armatures and close n circuit from ground, through its left-hand armetnre and contact, con tacts 4 and 3 of sequence switch spring 113, and thence through the operati r magnet of the sequence switch 100, to iettery; the relaywlfl being locked in its operated position bye circuit com lctefi hy the nttraction of its right-han armature. The sequence switch 100 will consequently more into its third position. In moving to its third position, a circuit will be closed midway between the second and t1 *rd positions. from battery through the coils of the brnshelevating magnet 45, contacts 3 and 4 of sequence switch spring 1041, the contact and right-hand armature of relay 14B. contacts 2 and 3 of sequence switch spring 195. find armature 144 of relay 13T to ground. This will energize the elevating magnet 145, which in turn will force the idler pulley against the elevating her 51, und the brushrod will start to move upward towardV the terminals of the first line in the panel henk. In this movement the'finger 94, will he engaged hy the tripping" pew! S8, associated with the brush-rod Vof the energized trippingr magnet 84, and the Ybrush will be tripped and moved so that the contacts 70, 71, 72 and 73 will rconnect with the line terminals of the bank when the brush reaches the pcfV sition opposite to' these terminals. Before the brush reaches the terminals ofi'the contact bunk, alcircuitwill be closed/from ground, through the commututor brush 58,

Contact. segment K, contacts 3 und 2 of se# queme switch spring- 1 117. and thence through the coil of the release relay 137, to battery, thereby energizing relay 137. This circuit -just tm'red will be open at the commutator segment K hei-'ore the sequence switch reaches its third position, and before to the sleeve terminal ot' themontart lionel the brushes multe rontiu't with the firstgroup ot' line terminals of the terminal henk.

The operntion oi" rehijiv lil? attracts its armature 1211i, which opens the lorking circuit previouslyv tritt-ed containing relay 133. the coils of the brush-trippingy :i'mg1wt,-nnd relay 135, which will therefore lie deiinergized und restored to normalY The nitritetion of armature 14% oi relay 13T opens a lockingrirruit containing the relay 143, which muy he traced from lmtte1'y,t hrough the coil of relay 1,43, the riglmhanil :trineture of this relay, contacts :2 and 3 of scrluenre switrh spring 105, and the iirmeture 144 of relay 1.37, to ground. Relay 143 will therefore, be denorgized. lVhen the circuit containing relay 121i is opened ut the com mutator segment K. this relay will he decnergized, and its rightdiand nitnro 1&4,

in falling back to normali. wili rinse ai circuit the right-hand armature und boeit rontuet 1 ot' relay 143, serpiente switch contacts 3 and 2 of sequenre switch spring 10G, sequence switch coni-ams ii and :i ui sequence switch spring 215, enti thfnee through the operar ing),l um et of sequence switch 200. to heb tel-y. his wii :time the sequence switch 200 into its set-ond or proteinen-(l )osltion2 Iendj.' to receive an incoming will rom the distrilmter und starting circuiti-s which have now all heen restored to normal.

ln the third position of the line finder sequence switch. the line finder brushes will hunt tor the terminals of the calling line. In thisl operation the brushes malte a double test, which consists primarily of n test of the sleeve rondan-tor for :l line condition. shiiw- Jng that the urpmi 'that is being tested hns of the line for Ehe rolling linti roisefilimt, that is, a closed suisrribefs oop. ennemi' hy' the removal of the receiver it the subscriber station. The sleeve c-onduetor of the brush. in 'testing lhsI .sleeve terminals ci' the lintx closes a cirruitlrom ground by wuv of they resistance roll 121 und thtl sleeve ofthe line und thence *by 'way ot' the sleeve brush. through contacts l sind -1 of sequence switch spring' 10T, und through the relay 145 to battery. ln rase the line. with which this sleeve circuit is associated. hns not been are viously ronnerted for use` the relay 115A will he energized and uttrnrt its armatures. The attraction ofthe armatures of this relay wili close n circuit, provided the line that is tiring tested is a cullingF line. from buttery. through the left-hund roi! of relay. 146. the inner armature and contat-i of rrlay'll. contacts 4 und 1 of sequence switch spring 108 to thc out on the ring side of the line und back. through the subscrlbers station, the tip Side V of the line.` the tip terminali of the contact bank and thetip lbr'ueh, the contacts lend' 4 of sequence switch spring 109, the outer armature and contact of relay 145, end

through the right-hand Winding of relay 146 to ground.

lf the line, that is being tested by the sleeve terminal. hns been previously connected for service, the relay 145, included in the sleeve circuit, will not be energized because it is shunted oy the resistance coil 161 associated with the other finder circuit which is connected in multiple to this sleeve terminal. The relay 145 'is so designed that it will notbe energized in parallel with the low-wound resistance coil 161. This sleeve shunt circuit, through the coil 161, is closed at contact 3 of equence switch spring 107 in positions 3i to .5 of the sequence switch, thus guarding the line during this interval. The low-wound resistance 161 iikewige shunts out the line sleeve relay 129, rheu- Vever the circuit through this relay closeda as the rotating brush 29 of the ceii finder connects with the sleeve segment of e busy line. This preventslthe operation of this re ley and the subsequent operation of the ine relay 128, which in turniv prevents the notuation of the aparetusin the line finder' storting circuit. xrfthismanner the unneceseery starting of Yline finders, by iines that.

have been connected for service, is prevented.

Consequently, when the sleeve conductor of the line finder tests a sleeve terminal of a. line which has been connected for service` the relay 145, asociated with its circuit, will not be operated, and consequently the relay 1 46 will not be connected to the line circuit und will not make n test of tbe tip und ring conductors of the line circuit. However1 for all circuits that have not been connected for service, the relay 145 will be energized, und

thus as the brushes of the finder circuit move l upward over the terminals o' the contact benk,`the relay will he intermittently op erated and connect the secondary test relay 146 to the tip und ring terminals of the various line circuits.

l/Vhen the tip and ring terminals of the line circuit, associated with n culling euhscribers line are reached, the relay i-'l will be energized. as previously explniucil. Flic operation of this relay closes: u circuit iron: ground. through its' armature :md umlac conv tact. through the contarte Ii und i m :eequence switch spring 1l0 nucl thc oicrntiug magnet of the sequcuce switch lof). lo im?A tery. This will move the sequence switch into its fourth position, which will decir ergizc relays 145 and 146.

`it there. finder switch being in one i, rIlhe cimuit arrangement illustrated in Figs. 9 and 1l is so provided that n plurality of cells may be stored or recorded. lNhen the brushes of the distributer switch encounter the terminals of n calling iine, the relay 12o (see Fig. 9), is locked up subject to the control of the relay 12T, thus recording the rziil in the slistributer circuit. if the starting circuit is free, the operated con dition of the relay 1.26 ieaile to the inciting? up of the relays 133 and 135, subject to conroi of the reluv 13'?, time tra! er; the mitte the starting circuit sind reo-ru relation with the starting rizcoi: recorded in the starting circuit finder switch. The transfer of the recorder call from the distrihuter circuit to 2 ing circuit f'reee the, distributor c. maken it resguueive to :my other @zillion Zinc the terminals of which nre cnrnumrrul. i, transfer of the recorded veli in tir:A .euri ur circuit to the'iinilcr e ritch that ie entri.' rcee the starting circuit and malice it sponsive to any other cull which muy iu ttmennwiiiie have been recorded in ille di trihuter circuit. Furthermore. the freeing of the starting circuit occurs inunedintelj.' upon the starting of the finder switch. und before another finder switch is brought into operative reintion with the starting circuit; so that the etui-ting circuit ie evzllnblc for storing or recording :i cull duringr the in tervul between thc storting oi' one timicr switch und thc lliuciug ot' :i yeer-oud irulcr switch in operative roiution with the rireuit. fihcreferc, ilu-rc muy bc two cuilr stored or recorded nt thc sume time, ouc in the Starting circuit. und lllc other in the die tlihutcr circuit. s thc trnuefcr of :i rccordeai cuil from thc distributor circuit to thc sturiug circuit inuncdintcly upon the starting of thc lmlcr Snitch freue the die triiuucr circuit und mulo-S it iunncduilely responsive to uuoihcr cuil.. this peculiar-ity of orguuxutiou multe-s the diei rillutcr cia ruit responsive to cells from lince whoec tcrminuls :irc closer, togcihcr on the dietriimter Switch ilhun'wmlld lic thc cueiit' thc freeing ol' the etui-ting circuit. und thc coieequen trcciug of .he distributor circuitu'cre dclnycd '.lulil n eccomi finder switch ie brought into nicht tivo relation with the storting circuitA Thc culling subscriber-E liuc is. no rmtuccicii through the line finder circuit to the other connecting :apparatus :it the oliice.

uml tumori in.i1ny,des=irahlc manner, und whcn ii iiluls flic torn'iinuls 'or' :in iflle selector r'iriuit or nu idle, connecting circuit, :is shown in thiVa particular vuihosliincnt of this invention. :l circuit will hc closed from ground, through tho repeating coil winding' 148 unil the= tip uhh oi' thil line` to the terminals und lululw: ut' tho rotary switch H7, contacts null 2 `ot` z-ioquoncc switch spring 10), theI tip, hin-ih uml torruinul of the line finder swurh :nul over the tip of the line to the ulwrilfcas Station. nncl back by way of the Y ring hul of thv lino, the ring tcrlninul und ir'ush ot ilul lino iiiuler Switch. contacts 1 i fi of Scipioni-v switch Spring 108, the ring i l :nifl torrninul oi' thc rotary switch 147, um! thcnffv through thc rcluy 1110 and thc wiwi!! inn' roil winding 14), to buttery. This wil cuor-flic thc rclny lf3() which will attract its uruiuiurc :mil closc u circuit from ground, through the armature and mukc Contact. of thin4 rol-uy. thc slrcre tcrminul und brush of ilul rotinv switch 14T. Contacts 2 und 3 of wgucncu ewiti'h spring 111, unil iicnve through thu operating magnet to the souuoiu-o Awitch 100, to buttery. This will univrlhc wqucnr'c switch into its fifth position. whiih is the Milking position of the limx iinilrr cir-ruit.

Thil culling suhhcrihor muy now bc con- ;uwwl lo tho sulm-i'ilscr ilosii'url, in any suit- ;ihic ummur. lYlu-n lho convie-mation is vmunuiml uml ilu milling suhSf-xihcl' hangs up hisv rwuivvix the' circuit. contuining thc -upcrvimiv roissy 11H1 in opcnwl unil thc 1'c im' is lviincrggizifft Thr return to norinul :its liul :unmturc of this; rciuy closus u circuit from ground, through thc iilmuturc :intl iarmil: mmm-t. tho twluinul :xml brush of thc mini-y witfh 11T. contacts X1 und 3 of .si-- :fui-uw witvh 111. unil thcI operating' magnet; :it .wfinvnw switch 100 to battery. The se- `iu-uw wifi-h 10U will (fonsoqncutiy nun'c mi! oi' u lilith position unil into its nightwnlh gimition, 'hcn the svqucnrr switch wm-hi its nights-#nih punition :i rirruit is i! from f frfunul. through vonturtfs 2 uml .l o5' wifiwuw `witch spring 112, :mil tho -f :trolling` nuiulfnct` 53 to butti-ry. 'Ji will vonscquvntly nitruct its un whirl! will muso thc ifllur pulleyy 54 lo :unito roulul-t with thc hnr 5l which in iun will vontur't with tho power roller 44, imi mnhoquuntly 1hrl hrush rofl will Sturt in wmf-n to normal. .lust utter the hrunhos huw iuinit li'uiinnl of thej contact hunk, iinE muuuiutulor lu u h 511 will rlosc u -rruit linings-muni, through thc oomnmiutor wunufnl il ihr ronrzuts i", und 2 of scrluonrc sawitfl. Spring 11? unil tho powor muguet of thv si-quvnre' :switch Inf), lo buttery. The wqueln'c switch 1011 will consoquvutly move into its iii-l position. As thc brush is rc turned to its normal position, the resetting finder circuit should fail to find the termi- A :mls of a calling line, and rise to the topmost terminal of the bank', a, circuit will be 010806. immcdiatcly after the brushes leave the to most. terminal, from ground through t e commututor brushes 58 and 59 Yin parallel thc commututor segment X,. contacts 1 ancl L of sequence switch pring 114 and thev power magnet of the sequence switch 100, to battery. As the Sequence switch spring 114 is Closed in its third and fifth positions, the sequence switch will move into lts eighteenth position, und in this movement will restore the line finder brush-rod, as .well as' ull the other upparutusassociuted with thev finder circuits, to normal. Thscircuit is provided as a precaution to] prevent the hrushv of u line` finder from traveling to theV topmost part ot the panel, vund, Iremaining there Without any means automatically rctm'ni1'i,r lr thc sumo.

It will lhc noticed that, the circuit which Contains the release relay l1,37 and which' is closml hy way of the sequence switch spring 117. is multipled to the sequence switch springs 217, 317, ctc., of the various line finder circuits, thus making thc release relay common to all the line finder circuits.

Further, should ull thc line finders become busy :it thc sume time, provisions urc'matle t'or moving thc sequence switch of tho-finder rin-uit, which is first relcuscd, to the second or prvscloctcfl position. This circuit may be trui-csi from l,rrounil.through f'ontucts audit of thv scquenco switch springlf, contacts 1 und 3 of soqucncc switch Spring 216, contar-ts 4 und 3 ot' sequence switch spring 116, und ussuining that, thc third line finder is the iii-st to rvturlrto normal, through contacts 3 und 4 of scqucn switch spring' 115, contacts 3 unil 4 of scquence switch spring 215i, contacts 3 and 2 of sequence switch spring 315. und ihn power mn ct of Soquence #wit-ch 300 to buttery. T is will nuovo the soqucnccuwitch 3130 into thv. second or presclec'tell position. ono or moro `of the line fimlcr circuits are or prcsclcctccl position. Tho starting loud ilonsequcntly wheneverz to thc scqucnce switches of the various liuc i ndcrs i multiplccl to contact of Soquence s'vitch spring 103,203, 303, ctc., of thc vurious:` line finder circuits, and therefore when-I 1 iillu, ono of them will be moved to thc second i ever the starting reley 135 is operated the particular preselected line finder will be started.

The ground which is supplied to loci; the relay 143 and furnish the ground for moving the sequence switch of the succeeding line finder circuit into its preselected position, is multiply connected to contact 3 of the sequence switch springs 105, 205, 305, etc., of the various line finder circuits. It will, therefore, be evident, due to this multiple connection, that at anytime when a line finder circuit is started and moves into its third position, the ground supplied by the release relay 137` will seek und find the next succeeding idle line finder switch and move the sequence switch of this finder circuit into its second or preselected position.

A special circuit, which serves as e precautionery measure for preventing the starting of two finder circuits, duc to special abnormal. conditions,.will now be described. Thus, if et any time the sequence switch of the first line finder should he in position 2, while the sequence switch of the .line finder circuit 2 is going out of position 18 and the sequence switch of the line finder 3 is in position l, the sequence switches of the line finders 2 and 3 might be moved into the preselected `position 2. Thus, these special conditions regarding the positions of the sequence switches of the three line finder .circuits will be assumed, and also that the reluy 137 has been denergized. A circuit can hen he traced from ground, through the armature 144 of relay 137, contacts 3 and 2 of sequence switch spring 105. the ri ght-hund erlnature end contact of relay 143, contacts 3 and 2 of sequence switch spring 106, contacts 3 and 4; of sequence switch spring 215, contacts 3 und 2 of sequence switch spring 315 and through the sequence switch power magnet 300, to battery.

Therefore, if cam A of sequence switch 300 closes before the sequence switch spring 215 opens` et contact 4, the sequence switch 300 will be moved into its second position. The circuit just traced will be opened et contact 4 of spring 215 when the sequence switch 200 movesinto its first position, and this will close a circuit through the power muguet of sequence switch 200 at contact 2 of sequence switch spring 215, and this sequence switch will also move into its second position. Consequently, when a. rround is supplied to the starting circuit y the armature 142 of relay 135, both sequencc switches 200 and 300 .would move into their third positions and start their line finders. To prevent this condition, the contacts 4 of the sequeno` switch springs 112, S212. 312, etc., are connected to a. common lead, which is likewise connected to contact 2 of the sequence switch springs 103, 202i end 303, ete. DueY to this con'unon connection, any sequence switch which is lnidwz'iy between its first :ind second position will close a circuit from ground to the sequence switch springs 103, 203, 303, etc.. ii' the sequence switch associated with either one of these springs is in its third position, and from there through the relay 143 connected to the finder circuit associated with such sequence switch to battery.

In the conditions which were assumed, the sequence switch oi the lirst line Finder circuit is in its third position. Then if it he further assumed that the cem A of sequence switch 300 has closed before the cum E215 of the sequence switch of line finder hns moved out of its eighteenth position, it will follow that when the sequence switch 300 is midway between its first and second positions, e circuit will he closed from ground, through cont-acts 2 and 4 of sequence switch spring,- 312, contacts 2 and 1 of sequence switch spring 103 and the relay 143, to buttery. This will energize relay 143 and thev attraction of its right-hand :armature will remove the ground connection which would be suppiied to the sequence Switch 200, by way of thc sequence switch spring 106 und the sequence switfh spring 215. The relay 143 will lock up over its make contact and right-hand armature, previously explained. und this locking circuit will not he interrupted until the sequence switch .101i moves ont of its third position. The release of this relay, after this sequence switch is moved out of its third position,

will not elfect the sequence switch 200, as this circuit is then opened et Contact 2 of the sequence switch spring 10G. Thus the simultaneous increment of The ftwo sequence switches inte the second position is prevented.

To prevent the operation of more `than one brush-trippin rod during the interval that one finder switch is being elevated, the multiple series circuit. illustrated in Fig. 11, is provided. W'llen. relay 130 hes been energized and locked up, a cire-uit is completed from the grind on the right-hund armature of this relay, through its left-hand low-wound winding, the armature 131, the coil and the armature 132 of relay 133, the armature 134 of relay 135 and armature 136 of relay 137, to buttery. Relay 133 is, therefore, energized and closes e circuit from ground, through its armatures 140 and 131, the coil ol the relay and its :irmatures 132 und 1411, und the Coil of relay and the armature 136 oi relay 137, to bettery. The closing of this circuit will energize relay 135 and attract its armature 134.

The break contacts of the armatures 132 of tho relays of tho 'nrions ilislrhutcr circuits arel Wired in multiplo tutti to tho hrozik contnot ofy tho arlnnttnv 134 of relay 135. Therefore, winanovox' 'tho armature 12H of relay 135 i in its ormai position, tho circuit` through witty 19,3 of :my one of tin lino iintti-,r fitnrtingg,` circuits can ho i-onipintmi, nini thin` relay, in purnliul with thu brush-trippinggnngiwt Si, will hn oporated. liownvor, whonevor any ono oi' the relays 133 is oprtitcil, n. circuit is clot-intl through tho rrhiy lit, which opons this circuit "t, iiruntturo litt until this rehiy 135 is iioiinurgizmi. ity will he rmnotnlwrini that thu iloinurgimtion ot tinl rvhiy 135, whirh is onrrgizrii iu ,Lwrius with thv rniiiy i323, (lvpi'niin upon tho opvrntion of thirtlruho ruin); lil?. :nui thib` rainy is lnnintninoti in itt; nnrrginti i-oniiiltion untii thr iiuwtiniilr hrnsh'roii han hoon vinvntmi nhovo tine tripping` pnwi :uni is nhnnt to Start. to tust, 'thu t't-rniinzzis oi' thv iilnpnnrl imni". At'this tinto tho rcln'y liti' is onorgizvil unil opnus tht lorlting.;l rit-ruit rontnining i'riny ttl, thu huish-tripping ning'nrt Hi, :uni ruiny 135, tutti titorlhy ng'lliu vonnitts tho multiplo ciriuiL nirmt to thi, nruintltrot; l'i ot' tho vnrions iiintrihutrr rrlnyfi 'l'ii to thv` ArmittoriI itil of rt'iuy lith, thun` rinsing tho nunnsl which .Hur-vw to onrrnizv tinbrush-tripping xnnn'nrt :nui rrhiy l'ii of any onol o' tho tiistrihulrr riri'uitst Thu ('oii oi' rthty 135 is ronnmtrtl to thv niinnttul'u '41 of tho first iiistriiuitor nii-vuil rihty 132i, nini thin uinniturn is wirttl through its hin'lt oontiu-t to tho nrnnitfuru l-ii oi' thv, next, rrltty lit-iii. This. sortoA circuit` is ooutinunii through thv nrlnztttltrs til nini routntts of nii of the \\hvn thv rircuit of om` hrusintripping nnigfnrty Hi is rimini, the ('uouits through thi hrush tripping' nmgnots oi' thil otin-r eiistrihulvr rn-rnnn :iro truipornriiy nt thv arnnltluo til ot om: of tho rotors '133,-

or tini zirnnituro lti'i Ht tin rtiuy 135.y or ut hoih points. 'ihis` i-oinlitiou is niniwlniuoii until thv hruHinwi oi' ont ot' tho lino tiniiors hun hwn tripprti inni tht in'nshtripping ning'nnt Si uml tho rviziiwA ii nnii 18V havo lit-0n -tioiinorgiznll h v thv operation ot thu rulrnsv witty 137. l 4

h tho storting condition ot' tht-` vulling lino prrisists up to the montent the vulling lino is iolnul, and its a sommi finder Switrh is put in roiniius tuut nnnhtgresponvixo to thv Starting rilouit" nt'. im nitrlit'r Stftgo in thu. innvotnent of the tindvr switch that is hunting `for 'the milling tino, provision is nnnio for iirprh'ingiA thi uniting!` lino of' controi owr ihn stnrting nirouit whiio tho milling lint` is living hunti'ii, :nui for mentoring thih` i-ontroi :it'lrr tho willing lino is found.

l'ihihi in viii-iut through tinv agout-.y of tho tli trihntrr winvh oporntns :is n timing inviti-ii. it.r tuttil o1' rotntiou hiring; no rrgulntvil thni tintinnrc-quirmi for tho hluhlu's Dit) to :h to inovt troni trrlniuuisl 2T to 2*.) inn-lt to thrsn tvrniinnls', j. e, to perform :t i-oinpivtai rotation, is fronti-r than thi' nmxiinlini their trquirvii l'or u iiun linlhr to im stnrtvli :uni onnof't with :my litnlA nl' tho group 'ihn result is that until tho vive-,tricot roiniition twisting on that tvrininni :ill in rhnnglmi its n rvsuii of tin. srixurr oia thiz` iinr hy :i lino tiniltr, tinroinvrgimtion ot' thi Hturtiitl rirvuit iunior tho rontrol oi thv. vniiing hun is provlnituti.

tiin'ionhiy. this invention is not, liniitril to ihr .wpmiiir viuhoiiinwnt hnroiu shown mui iirmfriiwli, hut is iznpuhlo oix tunny tnriutionn :oui :ippiiriitiomI without iop-.uitingf from 'upr -zp`|rit nini scopo.

0Whitt is uhiinimi is:

i. lu u tiitpiunn` ."Iystmn, tinooinhinzttiou with it group oi' tvinphoiw tions, :i iiin. witty, :l i'nli iilnhr Swilrh for uonnritiug Hniii litio rriny with Quill Winphone iinvs our` nttol nuotilvr iu rapiti Htllteziniiii.` n loi-hint;l Vrin)r iunior thv nonttoi oi' tin` tino rt-iny, anni :i Iini-` tiniior ,switih svt into opvrntion through thv` .utuntion oi' suini iin-hing rrlzty.

:5. in n tiiiphotw tr|n. tinl roinhinntion with :L group of tohphniw linut, n lilnt'riny` nii-:ins tor nssorinting :miti lino rihiy with thvr iniiivitiuzti iitunsl oi' saliti group onint'tvr nuothtl' iu lnpiii hurt-ovino` n 1m-,omi witty oth intimi iunior thtl vontroi oi' thiiiiu rrhly lult not ieponhiw to tho til-iinvrg'ivintion of Suhl lint` ri-iziy, n iitu limit-r switrh, :tuti n sturtrr riti-uit thru-tor oontl'oihii hy tlu` :n'ttuntiou oi'Y Hihi rirvonii tl-izlv.

1i. in n t'tiiphonv h'wtrni. thv roiuilinzition with :i group ot' tvivphouo lions. ot' n cow titsuomiy rotntiiml rnii tiuiirr switth :ohiptml to tit-.tigo uonuiuliom with thr iinih oi' tint trirpiunutint om ni'tt'r nnothri iu rapiti surrr ioln :t intron ot' lilrlrnt. :t iilnl rlizilv vonnnon to tinlinoy ot' finiti group :oni niiuptoli to iw inriuch-i with vHniii Sourrv oi' mirri-nt in tin tvnipornriiy tstnhiif-ln-il von noi-thin with vurh oi' rwill tiitphonr iinr nini lnonn-ntnriiy nrtimtmi ovvi' vnl-h tohphonilit'n with u'hirh it i5 oonntutmi if thtI toitu phoun iinx is riwzrli :it ihr sulwtntion, n rw# omi rtiriy rrsponwiw to tinl tturgimition ni' thv` iiin` rviziy iuit irrtspoir-livito thi livvnvrgriznlion ot' rsniti lino win);` :uni n iiiw iinilrr sn'irh :,-tnrtrti into optrntion h v tin` nt'turition ni' Asuiti Ftronii ruin):

i. in :i tnirphoiu xltsttui. tho ronihinution with u group ntf tniophoiw lino. :i iiinlinitvr switrh iii-Wing inuikod contiwts in which sing;

Lacasse lines terminate, a call finder switch having banked contacts 1n whlch said lines ter-- minste, a test conductor for each line terminatin in a Contact in each oi said switches, t ree brushes for each of sani "Switches, two registeringr with the contacts connected with the limbs of the telephone line and the third with the contact connected with the test conductor, a relay and source of current in circuit with the test brush of 'the call finder adapted to be actuated whenever a connection 1s established with a telehone line with which no other connection 1s at that time established, a line relay and source of current adapted to be connected in a bridge of a telephone line through con tacts 0f the first-named relay whenever the first-named relay is actuated,said line finder -lines terminate, an additional. test contact jfor each of said telephone lines, cooperating traveling contacts adapted to register with the passlve contacts of various lines one after another, a pair of test relays, one hav? ing its coil connected with the traveling Contact registering with the test contacts of the various lines and the other having its coil connected with the brushes registering V-Wiihtlne lineontacts of the various lines,

means on the test conductor of each line for ycomqiletingg an actuating circuit -for the first;

' best rela-y when 'the traveling contacts register with the line with which no other con nection has been established at. the central oilice, means for closing the circuit of the second test relay over a telephone line closed at the snbscribers station, and switching rire cuits controlled by the operation of the sec-- ond test relay.

6. In a telephone system, the combination with a group of telephone lines, of a pinralit;v of passive contacts at the central olif lice of the system on *which the limbs otf said lines terminate, an additional test Contact at the central otiice for each oi' sairl tele phone lines, means to test the test Contact of said line to determine whether or not a connection has been established with said line at the central ofiicc, and means artnntefl if no connection has been established with said line at the central office for making a second test to determine Whether or not the line is closed at the substation.

7. In a tele honeV systen., the comlsirew with a plurality of telephone lines, a g of contacte for each line and a plnra of switches to which said contacts are :n tiplied, a `group of travelling contacte each switch adapted to register with the e n- 'tarts of said lines om` after another, a primary and a secondary test relay for each group of traveling contacts, and means in one switch cooperating with` thc primary test. relay oi another switch. to prevent the scanditi-ary lest relay of the latter switch from being connected with itsy traveling contacts for testing purposes.

8. ln a i, phone systenn the combination with a plurality ot telephone lines, a test anni a mir of talking contacts tor saill line mnltipled to a plurality oi switching positions, a primary test relay at one of said po 'tronc for testing the busy or idle condition ci the nniitiple tesi Contact of said line, a seeondarg test relay controlled by said test relay and adapted to test the nonerfalling' .ronrlition of said line,

t at said multiple switching posii control the primary test relay as to pre it the socorulary test relay from making its test.

il. ,in a telephone s x'stem, the Combination trlfphone line. of passive switch con ie central otlcenpon which said minettes a 'test contact for said line ated with the passive contacts thereof, to :nalin a double test on the contacts (l line, the tiret responsive to the nonbusy (rendition of the test Contact of the line and the second rcsi'ionsivc to current in the line when the limbs are closed at the substation.

it?. in a telephone system. the combinaon with telephone line. of multiple pase terminals for said line at the central oiiicfc ot' the system. multiple test terminals for said line, a sets of traveling contacts afiapterl to register with the line and test terminals ot the. line.y a primary test relay connected with one of said traveling eontants, anti a aeronrlary test relay adapted to be connected with the other traveling contac-i through contacts of the primary test never a test is made upon a line 5i no other connection has been lisliorl at the central oilice.

erininalszfor said line at the cent-ral ot' the system. n1 nltiple test terminals sait? line. n set. ot traveling contacts tesi to register with the line anti est terni mals of the line. a primary test rela y connected with one of said traveling contacts, a. secondary test relay. and contacts of the prirnsrv test relay :for preventing the connecof the :woniar: test` relay With the cling co acts registering with the pasosterie cminccted with the limbs of the t ne line whenever another connection h.V .fern cstahlis mi with the limbs of said4 iin. ,u cnet-her point. at the central office.

' lin a telephone testing system, groups of passive terminals to he tested, traveling tcrnuuals atlaptctl to register with saul passive terminals, a primary test relay, u seeondury test relay having its circuit under the control nl' the primary test relay, and means to control the circuit; oli the lirst test relay through one oli thc contacts of said lgroup to either prevent; or pern'lit the seeontl test relay to test, another eontaet ol'. Said group.

13. In a telephone system, the eonrhiuzr tion with a l rronp of telephone lines, a call finder, a line finder switclua starting circuit lor saitl limiet' switch, Inc-ans controlled hy the eall intlcr tor verm-(ling a calf" in said starting' circuit, and means to obliterate sa'ul record when the line` linilor starts to hunt l'or the calling line.

14. ln a telephone system, the comhination with a lsgroup of telephone-lines, a line, relay, a call finder lor connecting said line relay with sait! telephone lines one after another in rapiti sucecssion, a line finder switvh, a starting circuit lor said line finder switch, lucans rontrollml hy said call lintler for closing saiil startingr eireuit, and means to open sait! starting eirruit when the line lhulcr switch begins to hunt; for the termi-- nais ol thc calling; liuc. i

15. Aln a telephone system, the eomlliiua tion with n group ol telrphone lines; ol' a cull linilcr, liuc lintlvr switches, a starting cirvuit l'or sa'nl line lintlrr switches, means unrlnr the control ol' thc rali linder lior closing saitl starting; circuit. means to open saitl starting' eircuit when one ol the lino lilulrr switches starts to hunt l'or the terminals ol': a vulling liuc :unl to assoriutc another line linilrr swilrh with saiil starting' circuit.

lt). ln n telephone system. a plurality ol' automatic switches, means lor prrscleeting our ol saiel su itrhcs. nuuns :u'tualeil hy the callin;r suhsrrihl-r Al'or starting said switeh, means controlled hy said switeh for rester ing saitl first: nuans1 :unl l'or preselcoting a srconel switch, :unl moans operated to aetnatc cach one ol salti plurality ol'l autolnutie switrhcs hel'ore said lirst, prcsoleeletl automatie switch is'ngain actuated.

lT. .In a telcphoni` system, a plurality ot lintvx lintlrrs, moans for prrsclcrling one ol sail] line linllers. means opcrntetl by a callin;a line lor starting saitl liuc finder, means rontrollml it); sutil line lintlcr for restoring said lirst menus :unl l'or prcselretiug a SPC@ circuit for eneh of said group relays; initial energizing circuits for said group relays, a common branch for said leirouils, and a switch operated luy any line of tlieg`roup in calling' for Closing the initial energizing Circuit to the corresponding group relay and disconnecting the relays of the succeeding groups from Said common branch.

19. The eomhination with a plurality of lines arranged in groups, of a finder switch atlapte'l for group and individual line selec* tion, a relay for each group adapted to be ol'wfratctl by any line of the group in calling mul adapted to eontrol'tlie group seleeting: operation ot" said finder-switch, a starting relay common to all of ysaid groupga hohling circuit, including the winding of said starting relay and adapted to be completed through any operated `group relay to maintain its energlzation, means controlled by said starting relay for starting the movement ol' saill limiter switch, and a relay cour' mon to said groups and ope'atel by saiil lintlcr switeh at, theend of the group selects lng operation for remlerit'ig.inolfeetive said 'ifiAV ,holding circuit.

The combination with u plurality of telephone lines arranged in groups, of n lptler switch adapted for group andY indivulual line srleetilou', a relay for each group :ulaptcil ,to he operated by any line of the group iu rallng and to control the group Selecting operation of said linfler switeh. a eonnnon holding circuit, adapted to he complctcil through any one. of saliti group relays 100 in its operation, :nul u relay eonunon to said groups for ront rolling' the (.-ontinuity ol' said holding' circ'nit, said ronunon relay heilig adapted to hv operated hy said liiuler switch at thc rmt'ot its group selecting operation to 105 routier sont holding circuit ineffective.

2l. 'l`lnl crunhiualion with :l plurality ol' linesl arranged in groups, ole :x linilrr switch :ulnptctl l'or group am] iulivifluul lint sclcrtion, group scha-ting!" trip magnetsI assi 110 rintrtl with said liiuler switrh, one for nach saitl groups ol' lines, a starting t-irruit tor lsaiil lintlcr switrh, a starting relay ronnnon lo all ol' saiil groups l'or ronlrollinp' saint starting cin-uit. a tlirixlrtl vuffrjiziug cirllt ruit including one ol saiil trip magnets in rauh ol' its hrzun'l'nsV anal including snitl starting relay in thxl ronnnon portion tlnfri ol'. lnrans under the control nl' au)A liuc in callinrr for rinsing;h saiil energizing rirruit. 12 hy wa;v ol the ln'auch that llails lo the trip u'angjuvl ol thcuoorresmnnling group. :mit int-uns inrlnilrtl u1 the counnou portion of `nhl energizing ril-ruit untloperateil at the mul ol' the group selecting operation of salti 12 limit-r switi'hV for rendering inellictire said` energizing circuiti. y

12. The combination with a plurality ofi lines, ol' a plurality of finder switches' lttor making connection therewith, Va starting cir-"1 for rendering said starting circuit inneces- Sible to sind calling line for n fixed und nr- 'bitrnry interval after seid circuit has been energizeil.

Q3. The combination with n plurality of lince, of n plurality of finder elwiicliee for making connection therewith. nit-nus tot:E moving `Suid {inder switchen, menue con trolled by any line in culling 'for making one of said finder Switches operative to corr neet therewith, means adapted thcrcnfter to deprive snif] calling` line of control over any other finder switch. und means oper ted independent of control by Said operated finder switch for restoring the control of said cull ing line.

'24. The combination with a plurality ot lines, of n plurality of finder switches :for making connection therewith, means actuated by the initiation of u cull for starting n finder witch to ineke connection with the calling line` means actuated in the Stnrtinnf ol said switch for rendering another yswitch reeponsirc to n calling line, :nenne made operative by the finder switch iu completing connection with the culling liuc for making ineffective llietarting condition of Suid line? und n, timing switch made effective :it the time ot' the starting of n finder switch for depriving said culling line ot control over unid storting means und for restoring control nt the eXpirntion of un interval greater thun that required for the storied lindcr switch to traverse all the linee of the l'roup.

Qn The combination with n `group oftclephone linee, of a plurality of finder switches for marking connection therewitln n Starting circuit tor seid finder .'-iwitchce energized by any line of the lugroup in culling. Suid finder switches being adapted to he stnrtod in succession by successive encrgizntions of Suid -utnrting circuit, and n timing switch .adapted to disconnect a calling liuc from the Starting. circuit at the time of the energizetiou of Suid circuit und reconnect .Quid lino nt the expiration of nn interval grenier than that required for said switch to traverse all the lines of the rqroup.

2(3. The combination with n plurality of lince. of n plurality of ndrr switches for milking connection therewith, n starting' ciri-.Lit adapted to be energized by nny of Suid linee in culling.: and udupted to slurf onc ofi Suid switches, Ineens operatingr to plm-,o the next switch under the control ol the etanting circuit nt the outset of niovciiu-ul ot' unid first mentioned switch, und nwuns uctuntcd by said first Switch in starting Jfor proventing; Suid cullingr line from stnrting Suid next Switch.

27. The combination with u plurality of lines. of a plurality of finder switches for making connection therewith, a starting circuit ndnpied when n line cells to stnrt one of Suid switches, menne adapted to place another of Suid switches under the control 7G of the etnrting circuit before the tiret switch luis i'ounfl the culling' liuc, und menne octuniell by .Quid irst switch in starting tor preventing Suid calling line from starting said other switch.

The combination with plurality of lines1 of n starting; circuit adapted tobe euergixfd by nny iine in calling, a finder switch adapted to be started by the encrgil zet-inn of Suid, circuit when n line calls, n second finder switch adapted to be brought into operative relntion with said circuit nftcr :sind irst switch starts and before it finds the culling line, and Ineens actuated by Suid first switch in starting for depriving seid, culling line of control over Suid Sturting circuit. before Suid second Switch is brought into ollurativc relation With said circuit.

he combination with a, plurality of 90 iineej of u. plurality ot finder switches lor making connection therewith, n Starting circuit with which one of said hwitclies is in operative relation; means actuated by any line iny calling for energizing said Starting circuit to Sturt seid switch, rnc-ans operating to bring another finder switch into operative relation with said starting circuit et the bef ginning of movement of seid nst mentioned Switch, and means actuated, by Said Started switch for deprivingr said ceiling line of control over enrifl storting circuit be fore said second switch coince into oper-mirc relation With'sid starting circuit.

30. The combination with si plurulity of 105 lines, of n storting circuit ndnpted to ne mede operative by any one ot' Suid lines in calling, line finder switches adapted to be brought consecutively under the control of unid Starting circuit at intervals lese than that `required for e finder switch to finde calling line, and a device actuated by a started switch and adapted to render n calling line ineffective to energize seid starting circuit after said line has energized seid cir- 116 cuit to Start u finder switch.

3l. The combination with a. finder switch adapted for grou u and individuel line Selection, of groups o lines extendin to groups of stationary terminals on sait switch, a 120 groi1psclection controlling magnet on sai Switch for euch group of terminals, an encrgininlg; circuit for @zich magnet edn ted to hc closed upon the initiation of e call y any line vin the corresponding group, and means under the control ot' sold finder switch for openinr Seid energizing circuit.

39.. Y,n e telephone exchange System, a plurnlity of si'ritchez:` euch having a. plurality of no1-muli y inactive brushes and e corre- 130 .eponiling' piurniiiy of' groups oi' siutiimary vonifuztn urrnuggvil io in! lruvuie'uii by Suid lnueluns |i-,epvilii'ul-ig iflvpiulun linee; al ruuglil in groups tnruiiiulliiug ibn `eniil glonps of uonlncls, tripping (invii-in` lor rendering will ln'uslui-f :ii-tive, wich tripping slevivu iseing; cfmmuon io n. plurality nf .Quill switches, unil menne uuinnuatirnliy nmniuel, u )on the initiutifm of n full ou :any nl' will lines t0 opi-rute e. tripping iieviuv lo rexulel' activo tluit brush of one ef miti switches which has :uu'vss to the terminal of the calling line.

:553. In :i teiephone exchange e stem, :i plurality of longitudinally move ile shafts, u plurality of normally ineefive brushes 0n euch ni' seid shafts, groupe of contacts m'- rnngml to be tmvm'sei-l by uuid brushes respectively, telephone line,u niultipiy eenneczlvil to eorrieponding Gunmen; of Seid Hwiiirlufs, tripping' deviene' for rcrulerin sii-id brushes :it-tive, nach trippinv deviee :actuated upon the initiation of a. mail en :my one of seid linee to operate that tripping dvviee which ie arranged to revienne the lu'iislnnlmving :remise to the vonteet terminnin oi' seid calling line.

Si. in :i telephone exchange system, n. plurality ni' iong'ituiliunlly movable shafts arranged in euhetuntinlly pzuiaillel relu'tinu to veel nflur, a plurality ol" multiply mnnvcteil lnfueh sluts nn riveli of Suid shufts,`

groupe oi' contents arranged to he tmwrsvfi by suifl brushes: respm'tiveiy, telephone linen multiply nnnneeieil to contacts at Sn'ul .ewitl'lu-e1 :i vontrnlling lenire for nach brush seti unruuilly retuiniug the liruslien thereof in inactive position, trip rolls extvnfling :nijni-eut to snil vnntrnlling (1i-view, mich trip roii living common to tiu riforr'xnpumliug cnntrulling levure on :i plul'ulily of Sniil switches; :nui ini-zins; nctuulml upon the ini-r tiation nf u, onli nu one of `miel lines to opernte tlult tripping iievien wiiii-,liis :issnqieti-il with theiirusii erin inning :weeen t( seid milling linee .'55, In n telnphnnu' exchange System, a

group ofrswitchee, enrh inning; :i piurnlty terminals of' `Quill culling linie.

I'. in n Ylvluplunw u u'imngfu svelini, :i

elmi'in, erh having :i lilac pinrzility :if nmleilig. eonnuon-tn uli 0f sind ewitees, und ineens ling device on any of Sel Infieens automatically actuated npmgthe 'initintion of e cnil en any of Se'r ln'es'toleper ate thet trip red which is armnged vte ceopernte with eentrolling devices of the brush sets which have access to the contact terminals nf Suid culling iine. Y Y

37, In e beiephone exchange system, e plurality of longitudinally movable switch shefte arranged substantially piueilel in the Same plane, nach shaft having n plurality of multiply connected brush sets, groups of poniente ene-h being arranged t0 he traversed by e different set of brushes,

telephone line multiply connected to con tarts in corresponding groups, a controlling device fur earl; brush Set normally maintaining the brushes thereof in inactive position, trip reds extending et right angles tn sul shafts but pm'nliel tu the plane thereof, said trip mils being mplul in number to the greatest number of brushes on :my one shaft, menne carried by seid trip rods arranged to empnrete with the correspondingly pesitioueil controlling devices'on any of mvilehvs to release the brushes thereof, and menne automatically actuated upnn the initiation of n null on any of Said lines for operating that trin rml which is arranged to eopvmte with the controlling devices ofy the brush setelmving accese to the enntect terminale of unir] t'nlllng line. E

38, In u. telephone exchange sysiem 'a plurality of euiisurihelfs,lines iiiyiderl'iuta *Y witehesiemh- 115W-V f uente vuela uw'itfii fr?? trippingiifveein unil menne nctim'tei'ii' on :my one of 'suini linesV ping li-vive whiea is arranged te cause t e l'iilvnse oi' ille brushes having access to the vulling lino group.

SW. ln '.1 telephone exchange Syteln; u plurnlity ni lines lividi-,d inte grou s, sivilvlws mull having e rnninf't bunk clviiliid into swtionnniu ivhivh sia'idline' gi'unpe re pi-r1ivglifiiiilluinuit'. brushes im 'much uf Huiil siijrrigylneom l'mmmh 50e@ Y iiuli` 'i'lrnllingf devi@ z nunuilly maintaining Suid hrushes'i vil'l'lntive posiseid' f4V its 'nement .any oi' suini switches, uw! monos s. l

tion. hush-tripping devices om fot: group of lines, euch of Suid iler'. ranged to release a correspovu cally actuated upon iriiilliug i ell of said lines for operating iluh vice arranged fo cooperate man y trolling devices of Liu lnfuslief: lia-mun nre-rss to tho Contact terminals of seici csilii line.

40. The combination saith e. plural of lines divided into groups, n finder swich, terminals for each of seid lines upon said finder switch movable brushes for switch, e brush for group or iiue for minals, an extension circuit having muliple connections with said brushes, means for causing the movement oi seid brushis, means for normally holdin each brush out; of engagement with the line terminals of the associated group, electromagnetic trip ping mechanisms, one being associated with each group of line terminals and adapted when operated 'to Cause the cor ponding brush Lo engage the associated line terinirsis .in the moveu'lcnt of. the switch, sterling mechanism for starring the movement. o said brushes, energizing paths 'for suini starting mechanism end said oiectromeg netic tripping devices1 and moeras operoed by any line in calling for closingP seid sneu glzing paths t0 operato the switch stering mechanism and the tripping deiioe of the group in which thc culling line is local.; l

41. The combination with a finder mviich having stationary terminals arranged in groups and s movable switch clement miopierl for group and individuel terminal ssf tion, motor niccllunism for moving said movable element, o trip :negocia on sei switch for each of Seid groups of stationary terminals, sind trip magnets being adapted to confrol the group selecting operation of 'Said movable element, telephone lines erf.-

tendiiig'A to said stationary terminals, and means made operativo by any line in initiating :L call [o energize said motor mechanism and the trip magnet of the group in which the culling liuc terminates.

4'2. In a telephone exrhaniresysiem, o. plu-` rality of switches ouch having a pluruligy of normally inactive brushes uuzi u corre-- spending plurality of groups of sieiionnrj; contacts arranged to be trnverserl by seid brushes respectively, telephone lines sin ranged in groups terminating in seid groups of contacts, tripping devices for rendering Suid brushes active. cnc-li tripping ievicc'he ing common to a plurality or Seial switches, means automatically actuated upon the initiation of a coll on any of said lim-s to operate a tripping device to render active that brush of one of sniii switches which luis access to the terminal of the culling line, andmieans whereby o single tripping de vice may remain ucluued el; e time.

ln :i 'i/:lophono cxcisi ii; oi.' swifchos euch having .woolly inactive hruslies .ini um; plurality of groups oi liv said :Tis arranged to be iruversm u brushes respectively, telephone lines urrslwgwl in groups terminating in soul groups ol contacts, tripping clericis for rcnueri .g said brushes ncive, erich tripping riz-vier ng common io u plurality o1' sam subit ies, menus zmonniiicelly actuated upon iiie initiation of a coll on any of said lino-s operato o tripping device io onder ucii'o riait iiiush of one of Suid switches which lios access lo lic icrminul of the Talling Eine. and means for preventing '.i plurai-litV seid tripping devices remaining actuuiefl si. e. time.

44. The @ifouibinution with u finder switch haring e plurelity of groups of sierimmry terminals and e movable element provided with brush for each group of stationery tei-winnie, of telephone lines connected with eiiouury terminals un sesion, cin king multiple courier-sicu nul: the #s o? seid movable elernen. urfi'hooisni ing; ihe movement 0E scid mov-aigle si. n. flipping lorica ,for euch oi said Y:ipfeil when operativ! lio cerise the iis movement 1o engage ilu simio :finals of he corresgiloiuiiug groups, ziug cirrut for said moving' mooi nl smid tripping fioriere. switching 1 associated ,willi mich group if ixdnptvrl when operated to reuse lince und the encgizntion of surl moving mechanism,

unrl the ripping f ierice of the corresponding group, and means meule operativo in ille operation of the switching mechanism olf auch of soifl lfroups lo prevent the operation of the s -ironing mechanism' of :my other group.

ifi. The combination with n plurulitj,1 of loiephouc lines divided into groups, of in extension circuit common therein. :i inficr switch adapted to connect said extension circuit wi'h any line in any of said groups, mechanism for causing ilu. movement of Suid finder swich. :i group identifyingf (lcvice on 'seul finder switch for each of said groups of lines, moons mudo operativo in the initiation of u call by :my of sold lines for operail ig said switch moving mechanism nml ihe ielr-uiziying device corresponding with Sie group in which the culling: lino is loreei, :mel nir-:ms uuulc uolive in rho operation of may' of said Pgroup identifying il@ vir-es for reurlrririfhr ihr ififulifying lviires of The other groups inoperative.

siii. The rinuiiiuzlloo willi :l firulcr svfirali hsvi :a pluruliiy of stationary l'oreoiuols :.irrzirgr-:i in groups nucl u iuuiiipii n'ioifisio eli-ment: with n uormui')` ii. brush .for erich of said groups oi' fsf-dimm j* tcrx'oiisis, ,of :L trip poignet on mili 

